package com.ruoyi.framework.aspectj;

import cn.hutool.core.collection.CollectionUtil;
import com.ruoyi.common.annotation.DataScope;
import com.ruoyi.common.core.domain.BaseEntity;
import com.ruoyi.common.core.domain.entity.SysRole;
import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.core.domain.model.LoginUser;
import com.ruoyi.common.core.text.Convert;
import com.ruoyi.common.utils.SecurityUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.framework.security.context.PermissionContextHolder;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;

/**
 * 数据过滤处理
 *
 * @author ruoyi
 */
@Aspect
@Component
public class DataScopeAspect {
    /**
     * 全部数据权限
     */
    public static final String DATA_SCOPE_ALL = "1";

    /**
     * 自定数据权限
     */
    public static final String DATA_SCOPE_CUSTOM = "2";

    /**
     * 部门数据权限
     */
    public static final String DATA_SCOPE_DEPT = "3";

    /**
     * 部门及以下数据权限
     */
    public static final String DATA_SCOPE_DEPT_AND_CHILD = "4";

    /**
     * 仅本人数据权限
     */
    public static final String DATA_SCOPE_SELF = "5";

    /**
     * 数据权限过滤关键字
     */
    public static final String DATA_SCOPE = "dataScope";

    /**
     * 数据范围过滤
     *
     * @param joinPoint  切点
     * @param user       用户
     * @param deptAlias  部门别名
     * @param userAlias  用户别名
     * @param permission 权限字符
     */
    public static void dataScopeFilter(
            JoinPoint joinPoint,
            SysUser user,
            String deptAlias,
            String userAlias,
            String ownerAlias,
            String permission) {
        StringBuilder sqlString = new StringBuilder();
        List<String> conditions = new ArrayList<String>();
        List<String> scopeCustomIds = new ArrayList<String>();
        user.getRoles().forEach(role -> {
            if (DATA_SCOPE_CUSTOM.equals(role.getDataScope()) && StringUtils.containsAny(role.getPermissions(), Convert.toStrArray(permission))) {
                scopeCustomIds.add(Convert.toStr(role.getRoleId()));
            }
        });

        if (CollectionUtil.isNotEmpty(user.getRoles())) {

            for (SysRole role : user.getRoles()) {
                String dataScope = role.getDataScope();
                if (conditions.contains(dataScope)) {
                    continue;
                }
                if (StringUtils.isNotEmpty(permission)
                        && StringUtils.isNotEmpty(role.getPermissions())
                        && !StringUtils.containsAny(role.getPermissions(), Convert.toStrArray(permission))) {
                    continue;
                }
                if (DATA_SCOPE_ALL.equals(dataScope)) {
                    sqlString = new StringBuilder();
                    conditions.add(dataScope);
                    break;
                } else if (DATA_SCOPE_CUSTOM.equals(dataScope)) {
                    if (scopeCustomIds.size() > 1) {
                        // 多个自定数据权限使用in查询，避免多次拼接。
                        sqlString.append(StringUtils.format(" OR {}.dept_id IN ( SELECT dept_id FROM sys_role_dept WHERE role_id in ({}) ) ", deptAlias, String.join(",", scopeCustomIds)));
                    } else {
                        sqlString.append(StringUtils.format(" OR {}.dept_id IN ( SELECT dept_id FROM sys_role_dept WHERE role_id = {} ) ", deptAlias, role.getRoleId()));
                    }
                } else if (DATA_SCOPE_DEPT.equals(dataScope)) {
                    sqlString.append(StringUtils.format(" OR {}.dept_id = {} ", deptAlias, user.getDeptId()));
                } else if (DATA_SCOPE_DEPT_AND_CHILD.equals(dataScope)) {
                    sqlString.append(
                            StringUtils.format(
                                    " OR {}.dept_id IN ( SELECT dept_id FROM sys_dept WHERE dept_id = {} or find_in_set( {} , ancestors ) )",
                                    deptAlias,
                                    user.getDeptId(),
                                    user.getDeptId()));
                } else if (DATA_SCOPE_SELF.equals(dataScope)) {
                    if (StringUtils.isNotBlank(userAlias)) {
                        sqlString.append(StringUtils.format(" OR {}.user_id = {} ", userAlias, user.getUserId()));
                    } else if (StringUtils.isNotBlank(ownerAlias)) {
                        sqlString.append(
                                StringUtils.format(" OR {}.create_by = {} ", ownerAlias, user.getUserId()));
                    } else {
                        // 数据权限为仅本人且没有userAlias别名不查询任何数据
                        sqlString.append(StringUtils.format(" OR {}.dept_id = 0 ", deptAlias));
                    }
                }
                conditions.add(dataScope);
            }

            // 角色都不包含传递过来的权限字符，这个时候sqlString也会为空，所以要限制一下,不查询任何数据
            if (StringUtils.isEmpty(conditions)) {
                sqlString.append(StringUtils.format(" OR {}.dept_id = 0 ", deptAlias));
            }

            if (StringUtils.isNotBlank(sqlString.toString())) {
                Object params = joinPoint.getArgs()[0];
                if (StringUtils.isNotNull(params) && params instanceof BaseEntity) {
                    BaseEntity baseEntity = (BaseEntity) params;
                    baseEntity.getParams().put(DATA_SCOPE, " AND (" + sqlString.substring(4) + ")");
                }
            }
        }
    }

    @Before("@annotation(controllerDataScope)")
    public void doBefore(JoinPoint point, DataScope controllerDataScope) throws Throwable {
        clearDataScope(point);
        handleDataScope(point, controllerDataScope);
    }

    protected void handleDataScope(final JoinPoint joinPoint, DataScope controllerDataScope) {
        // 获取当前的用户
        LoginUser loginUser = SecurityUtils.getLoginUser();
        if (StringUtils.isNotNull(loginUser)) {
            SysUser currentUser = loginUser.getUser();
            // 如果是超级管理员，则不过滤数据
            if (StringUtils.isNotNull(currentUser) && !currentUser.isAdmin()) {
                String permission =
                        StringUtils.defaultIfEmpty(
                                controllerDataScope.permission(), PermissionContextHolder.getContext());
                dataScopeFilter(
                        joinPoint,
                        currentUser,
                        controllerDataScope.deptAlias(),
                        controllerDataScope.userAlias(),
                        controllerDataScope.ownerAlias(),
                        permission);
            }
        }
    }

    /**
     * 拼接权限sql前先清空params.dataScope参数防止注入
     */
    private void clearDataScope(final JoinPoint joinPoint) {
        Object params = joinPoint.getArgs()[0];
        if (StringUtils.isNotNull(params) && params instanceof BaseEntity) {
            BaseEntity baseEntity = (BaseEntity) params;
            baseEntity.getParams().put(DATA_SCOPE, "");
        }
    }
}
